Circumstellar disks are the cradle of planetary systems.
High-angular-resolution observations of these disks have revealed a plethora of structures, including spiral arms, warps, gaps, and radial streams
that might be related to ongoing planetary formation [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}.
Great efforts have been made to detect protoplanets embedded in these disks using different observational techniques. As a result, there are now two confirmed protoplanets around the star PDS 70 [8]}, [9]}, one around AB Aur [10]}, and a significant number of candidates [11]}, [12]}, [13]}, [14]}, [15]}.
